{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80707","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.787Z","datePublished":"2026-08-28T06:53:08.244Z","dateUpdated":"2026-08-29T06:22:24.493Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-29T06:22:24.493Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: transport: j1939_session_fresh_new(): initialize receive buffer\n\nZero the allocated buffer in j1939_session_fresh_new() to ensure it\ncontains no residual data.\n\nWhile there is a potential performance impact if users allocate maximum\nsized ETP buffers, most real-world use cases are not noticeably affected\nsince the maximum known buffer size is typically around 65K.\n\n[mkl: add Message-ID]"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - Received J1939 TP/ETP RTS frames enter j1939_can_recv()→j1939_tp_recv()→j1939_xtp_rx_rts_session_new()→j1939_session_fresh_new() from the CAN receive path with no local syscall; telematics/CAN gateways routinely expose J1939 to remote peers, consistent with prior kernel CNA scores for the same subsystem (e.g. CVE-2023-52887, CVE-2026-22997).\nAC:L - The attacker controls RTS-declared message size, DATA/EOMA sequencing, and timing; skb_put() leaves the entire allocation uninitialized, j1939_xtp_rx_eoma_one() completes without verifying all data packets arrived, and recvmsg returns the full skb length—reliably mixing attacker data with residual heap bytes (including trailing padding).\nPR:N - J1939 receive processing has no authentication gate; an unauthenticated CAN/J1939 peer can send crafted transport-control frames to a victim ECU that already runs a bound J1939 socket (normal automotive, trucking, and industrial deployments) without any Linux account or capability on the target.\nUI:N - No victim interaction is required beyond the target already operating the J1939 stack with a bound socket; the attacker only transmits crafted frames on the bus to trigger session allocation and completion.\nS:U - Uninitialized kernel heap contents are disclosed to matching local J1939 socket owners via recvmsg; impact remains within the same kernel security authority and does not cross VM, IOMMU, or sandbox boundaries.\nC:H - j1939_session_fresh_new() allocates the receive buffer with skb_put() instead of skb_put_zero(), so unfilled bytes retain prior slab contents; on completion j1939_session_completed() delivers the full total_message_size buffer (up to tp_max_packet_size, commonly ~65K) to userspace, disclosing kernel pointers and heap data.\nI:N - The bug only omits zero-initialization of the receive skb; there is no out-of-bounds write, use-after-free, or other memory-corruption primitive enabling integrity impact.\nA:N - Sessions complete or abort normally without kernel panic, oops, hang, or resource exhaustion; the vulnerability is an information-disclosure defect with no availability impact."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/j1939/transport.c"],"versions":[{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"348818277a3646d5b9fa60c9d20c00dc4bc86832","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"f3e120a34b336079479fa10f706f0636eaa6e751","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"bbfa49d1e287de44994955b44d19281be3195b44","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"194d67e92197eb820f4c2c6605d9721333b3eba0","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"038bad8e16c2e28acf31f0b527a816fb23a57269","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"8604a3b81b9d0ceaf04fee5f52e701f623a179f9","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf","status":"affected","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","lessThan":"eb96c58907922546e415e545fe9a14ea63b02719","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/j1939/transport.c"],"versions":[{"version":"5.4","status":"affected"},{"version":"0","lessThan":"5.4","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.151","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.103","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.44","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/348818277a3646d5b9fa60c9d20c00dc4bc86832"},{"url":"https://git.kernel.org/stable/c/f3e120a34b336079479fa10f706f0636eaa6e751"},{"url":"https://git.kernel.org/stable/c/bbfa49d1e287de44994955b44d19281be3195b44"},{"url":"https://git.kernel.org/stable/c/194d67e92197eb820f4c2c6605d9721333b3eba0"},{"url":"https://git.kernel.org/stable/c/038bad8e16c2e28acf31f0b527a816fb23a57269"},{"url":"https://git.kernel.org/stable/c/8604a3b81b9d0ceaf04fee5f52e701f623a179f9"},{"url":"https://git.kernel.org/stable/c/d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf"},{"url":"https://git.kernel.org/stable/c/eb96c58907922546e415e545fe9a14ea63b02719"}],"title":"can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer","x_generator":{"engine":"bippy-1.2.0"}}}}